package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@RequiredArgsConstructor
public class DishServiceImpl implements DishService {

    private final DishMapper dishMapper;
    private final DishFlavorMapper dishFlavorMapper;
    private final SetmealDishMapper setmealDishMapper;
    private final SetmealMapper setmealMapper;

    /**
     * 新增菜品和对应口味
     *
     * @param dishDTO
     */
    @Override
    @Transactional
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = dishDTO.convertToObject(Dish.class);
        // 菜品插入一条数据
        dishMapper.insert(dish);
        // 获取insert语句的主键值
        Long dishId = dish.getId();
        // 口味插入多条数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            // 口味插入多条数据
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     *
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(), dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page.getResult());
    }

    /**
     * 批量删除菜品
     *
     * @param ids
     */
    @Override
    @Transactional
    public void deleteBatch(List<Long> ids) {
        //  查询菜品状态，判断是否可用进行删除
        for (Long id : ids) {
            Dish dish = dishMapper.getById(id);
            if (dish.getStatus() == StatusConstant.ENABLE) {
                // 菜品状态为起售则不能删除
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }

        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        if (setmealIds != null && !setmealIds.isEmpty()) {
            // 当前菜品有在售套餐，不能删除
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }

        // 删除菜品
       /* for (Long id : ids) {
            dishMapper.deleteById(id);
            // 删除 菜品关联的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }*/
        // 删除菜品
        dishMapper.deleteByIds(ids);
        // 删除 菜品关联的口味数据
        dishFlavorMapper.deleteByDishIds(ids);


    }

    /**
     * 根据id查询菜品和对应的口味数据
     *
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish = dishMapper.getById(id);
        // 根据菜品id查询口味数据
        List<DishFlavor> dishFlavors = dishFlavorMapper.getByDishId(id);
        // 将查询到的数据封装到vo
        return dish.convertToObject(DishVO.class, d -> {
            d.setFlavors(dishFlavors);
        });
    }


    /**
     * 修改菜品和对应的口味信息
     *
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        Dish dish = dishDTO.convertToObject(Dish.class);
        // 修改菜品数据
        dishMapper.update(dish);
        // 删除原有口味数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        // 添加新的口味数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && !flavors.isEmpty()) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品起售停售
     *
     * @param status
     * @param id
     */
    @Override
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && !setmealIds.isEmpty()) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }


    /**
     * 根据分类id查询菜品
     *
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }
}
